Plate 1 issued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.230, Fig.78].
Female: a, habitus (left side); b, c, urosome (left, dorsal, respectively); d, e, forehead (left, dorsal, respectively); f, g, h, genital somite (left, ventral, right, respectively).

Nota:
- Prosome length 70 % length of body and about 2.3 times length of urosome.
- Forehead angular and produced ventrad into a small rostrum bearing 2 slender filaments. dorsally, midanterior tubercular process (fig.78 e) tapering into a pointed tip.
- Cephalosome 46 % length of prosome, with a cervical groove halfway along dorsal margin
- Posterolateral corner of prosome rounded.
- Length ratios of 4 urosomal somites and left caudal ramus 38.8 : 18.7 : 13.7 : 8.8 : 20.0 = 100.
- Left caudal ramus extending beyond posterior end of right ramus by about 1/5 its length( as measured along medial margin). Dorsal appendicular seta of left ramus almost twice as long as that of right ramus.; 4th marginal seta of left ramus much thicker than other marginal setae and longer than body. Dorsally, each caudal ramus with a relatively large pore.
- A1 reaching close to posterior end of caudal ramus.

Plate 2 issued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.231, Fig.79].
Female: a, left Mx2 (posterior); b, P5 (anterior).
Nota: Mx2: Falcate spine of 5th lobe with proximal 54 % of medial margin serrated with spinules; falcate spine of 6th lobe with proximal 63 % of medial margin serrated with spinules. (compare with H. spinifer fig.76 g).

Male: c, right P5 (endopod omitted), anterior; d, left P5 (anterior); e, exopod of P5 (anterior).

Nota male:
- Prosome 71 % length of body; urosome 30 % length of body.
- First 4 urosomal somites armed with relatively large spinules along posterior margins.
- Caudal rami and setation as in female.

Plate 3 issued from : G.D. Grice in Fish. Bull. Fish and Wildl. Ser., 1962, 61. [p.221, Pl.24, Figs.13-16]. As Heterorhabdus papilliger.
Male (from equatorial Pacific): 13, habitus (lateral); 14, Mx2; 15, P5; 16, distal end of protrusion of 2nd exopodal segment of right P5.

Plate 4 Heterorhabdus prolatus female:
1 - See key to species groups of Heterorhabdus: ''papilliger'' Group (p.90, 102).
2 - Midanterior tubercular process of forehead produced into an angular process (Fig.78-e) and not produced into a spiniform process. P5 with inner marginal seta on 1st endopodal segment (Fig.79-b).
3 - Laterally, genital prominence extending far shorter to posterior end of somite (Fig.78-b).

Plate 5 Heterorhabdus prolatus male:
1 - See key to species groups of Heterorhabdus: ''papilliger'' Group (p.90, 102).
2 - Midanterior tubercular process of forehead angular and not produced into a spiniform process. Basal inner lobe of left P5 rather poorly developed and angular distally (Fig.79-d)
3 - In right P5, medial projection of 2nd exopodal segment not terminally expanded, somewhat truncate, with nearly parallel proximal and distal sides (Fig.79-c).